SAN FRANCISCO/BERLIN (Reuters) - Airbnb, the online lodging service that investors now believe is worth $30 billion, faces a reckoning.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=DQUvOB2QLDY:jr6ib5i6F5Q:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?d=yIl2AUoC8zA" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=DQUvOB2QLDY:jr6ib5i6F5Q:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=DQUvOB2QLDY:jr6ib5i6F5Q:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=DQUvOB2QLDY:jr6ib5i6F5Q:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=DQUvOB2QLDY:jr6ib5i6F5Q:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/DQUvOB2QLDY" height="1" width="1" alt="" />